What this MCB is and what it does
The Siemens SENTRON 5SN6350-7CN is a 3-pole miniature circuit breaker (MCB) rated 50 A with a C tripping characteristic, designed for 400 V AC systems at 50/60 Hz. It provides overcurrent and short-circuit protection in final distribution circuits, with a breaking capacity of 6 kA according to EN 60898. The C-curve (tripping between 5 and 10 times rated current) suits it for inductive and motor-starting loads where inrush is moderate — common in commercial and light industrial panels. Rated for overvoltage category III and pollution degree 2, it mounts on a DIN rail in any position, occupying 3 modular width units (54 mm). The IP20 enclosure (with connected conductors) is standard for enclosed distribution boards.
Integration and installation notes
The 5SN6350-7CN accepts solid conductors up to 25 mm², and its 70 mm installation depth fits standard distribution board depths. It is sealable and halogen-free/silicon-free — relevant for environments where outgassing or contamination is a concern. The design supports bolt-on auxiliary devices (shunt trip, alarm switch, auxiliary contact) for remote signaling or emergency-off integration. Power loss per pole at rated current in hot state is 3.6 W — factor this into enclosure thermal calculations when grouping multiple breakers. Vibration resistance per IEC 60068-2-6 is 50 m/s² at 25 to 150 Hz, adequate for most fixed-installation environments.
Environmental and compliance
Operating temperature range spans -40 °C to +75 °C, with periodic humidity up to +55 °C and 95% RH. The neutral conductor is not switched by this breaker (3-pole, solid neutral). Touch protection (finger-safe terminals) is standard.